參數(shù)資料
型號: P80CE598
廠商: NXP Semiconductors N.V.
英文描述: 8-bit microcontroller with on-chip CAN
中文描述: 8位微控制器芯片的CAN
文件頁數(shù): 43/108頁
文件大小: 507K
代理商: P80CE598
1996 Jun 27
43
Philips Semiconductors
Product specification
8-bit microcontroller with on-chip CAN
P8xCE598
13.5.9
B
US
T
IMING
R
EGISTER
0 (BTR0)
The contents of Bus Timing Register 0 defines the values
of the Baud Rate Prescaler (BRP) and the Synchronization
Jump Width (SJW).
This register can be accessed (read/write) if the Reset
Request bit is set HIGH (present).
For further information on bus timing, see
Sections 13.5.10 and 13.5.18.
Table 45
Bus Timing Register 0 (address 6)
Table 46
Description of the BTR0 bits
7
6
5
4
3
2
1
0
SJW.1
SJW.0
BRP.5
BRP.4
BRP.3
BRP.2
BRP.1
BRP.0
BIT
SYMBOL
FUNCTION
7
6
SJW.1
SJW.0
Synchronization Jump Width.
To compensate for phase shifts between clock
oscillators of different bus controllers, any bus controller must resynchronize on any
relevant signal edge of the current transmission. The synchronization jump width
defines the maximum number of clock cycles a bit period may be shortened or
lengthened by one resynchronization:
t
SJW
t
SCL
2SJW.1
SJW.0
1
+
+
=
5
4
3
2
1
0
BRP.5
BRP.4
BRP.3
BRP.2
BRP.1
BRP.0
Baud Rate Prescaler.
The period of the system clock t
SCL
is programmable and
determines the individual bit timing.The system clock is calculated using the following
equation:
t
SCL
2t
CLK
32BRP.5
16BRP.4
8BRP.3
+
+
=
Where t
CLK
= time period of the P8xCE598 oscillator.
(
)
4BRP.2
2BRP.1
BRP.0
1
+
+
+
+
(
)
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